
Book Cheap United flight from Washington (IAD) to Seattle (SEA) from CA $415
Find The Best Day to Book a Cheap United Flights From Washington to Seattle
Cheapest United Flights from Washington (IAD) to Seattle (SEA)
The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were round trip and CA $415 one way. Prices and availability subject to change. Additional terms may apply.
Frequently asked questions
Grab a great United flight from IAD to SEA
To find a great deal on United flights with Travelocity, simply enter your origin and destination airports, pick your travel dates, and hit search. From here, you can sort by price, flight duration, and arrival/departure time. You can also filter to find nonstop flights.
Flying United Chantilly to Seattle gives you fights to choose from. With that direct flight time of , you’ll be touching down before you know it.
Find cheap flights with United between Chantilly and Seattle
United has a range of great fares on stacks of flights, and to find the most affordable for you, there are a few tricks you can try. Booking in advance, for example, is a great way to grab a fantastic deal. Also, choose the cheapest month, if you can. One-way flights from Chantilly to Seattle with United are May.
The more flexible you are, the more affordable flights you’re likely to find. Consider one-way flights and connecting flights, as well as standard roundtrip and direct options. Even if you’re flying today, cheap last-minute flights are easy to find by entering your travel dates and hitting search.
Reasons to book your United flights with Travelocity
Travelocity makes it easy to book a seat, anywhere in the world. The vast inventory, fast search, and advanced filters put some of the best deals on the planet in one place. Whether you’re traveling on business, with friends, family, or on your own, take your pick from some fantastic options. And with free cancellation and pay later options, you can travel more and worry less.
Airport code | Country | Airport name | Number of flights |
|---|---|---|---|
| ORD | USA | O'Hare Intl. | 227 |
| DEN | USA | Denver Intl. | 226 |
| IAH | USA | George Bush Intercontinental | 136 |
| IAD | USA | Washington Dulles Intl. | 100 |
| SFO | USA | San Francisco Intl. | 64 |
| LAX | USA | Los Angeles Intl. | 23 |
| EWR | USA | Liberty Intl. | 20 |
| FRA | DEU | Frankfurt Intl. | 19 |
| NRT | JPN | Narita Intl. | 19 |
| PEK | CHN | Capital Intl. | 16 |
Travelers ❤️ these 🏨 after their flight to Seattle

DoubleTree by Hilton Seattle Airport
Great stsy
Reviewed on Mar 21, 2026

Coast Gateway Hotel
Rooms are very small, but for one night was fine. Airport shuttle was very convenient and very organized.
Reviewed on Mar 21, 2026

Country Inn & Suites by Radisson, Seattle-Tacoma International Airport, WA
Breakfast is great, location is good
Reviewed on Mar 21, 2026
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